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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '233cc5732dc184d31a2104b5d74ddf686fab1879f428d38288b079d795e17820' 
  AND token = 'Pdw9yWPKUbXA5KZ6b1Fsp+VLxdLx8JvREmSVeDcGrXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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