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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '962261e8f1cf2094f2362576301aec2b2a5a2b11f338916f6a3f5c7df9f1c6ad' 
  AND token = 'ON6Saa7BRsEB1r9SCDONNNz2BI9p1PBQXTRJ1jXcJqU=' 
  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"
    }
  }
}