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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fd62679200010c35e89763b4306605398bbd61661ccb2c1de1795adfb05e282' 
  AND token = 'K9NjaBXUEOB1bevjIbbF+xZXYi8xDli7vd7T2WD8f4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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