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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25b9361eb66a7adb6275f2419767c23531a71223c1d00a1867d5829f1ca5a9af' 
  AND token = 'UNSHi22g8PMVmu+hi/BFqvz/7bREguuTdWcmy3fUj60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}