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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29ac5efcd86d7f3e4be368f0fe38927cdcd309577546d8321cf1a604da2508bb' 
  AND token = '5eaddGF1j+rFN8TIFiKDu/CWyR+1q4q6iFiahl7mX94=' 
  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"
    }
  }
}