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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e99b9a80b17435a67857c0c3e015142ee51c6a4e06c0aa3791ca70ef2472ae78' 
  AND token = 'TToJLCZ3Jd/wpKFI98kE2odQUAeAXgmZhA5aGEOr/ow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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