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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '593bf73b28179736191bc50f1287f63b1e9fa389998a30375d074d330c89150f' 
  AND token = 'tdbAsDkBLdzk5YaXaLSJ/o1spOagedKdUqERn9waEGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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