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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1edaa2b9e1c1ea80d41a31d80c809b675075fe130ec2fef24280cb6bc2b64e30' 
  AND token = 'fkI4DE8Pw4ZiDNM+tpM9A6RdH3iw9JkG8UztpQC2orY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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