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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09a2bd1b2612d11cf7710fb2906cc8f27d0c9c97fad165ccc0d773143695ab59' 
  AND token = 'YMADBOiL1dV9iqJUU07yLKkkR2n40mTtMhz2TREsc0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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