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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13fe90b7e5a3792fef368b8a3c9df3a683ed9fb03fa3336ec5e6408f27799faa' 
  AND token = 'hK7OeHZf4j4XxMwlQ1mzs/fMbG1GYvs7UE+X31lbVFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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