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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baf951b12f13e8e00fcd32a02b725976ea545f31c247bc54df391ff29fe1ff3e' 
  AND token = '6GioKP4lbCz31ADB7lPYYUu7nIBIozBKlV6s63IxmnU=' 
  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"
    }
  }
}