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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8ffff7dafe36425f71bd92a9fd5cc570247ccb64c4baefef6decc9e3b431ca2' 
  AND token = 'bws6UyrZnZgz7ZPYyjr2lWRgK6GhCalR4vZu0NK5vdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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