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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55ab34c6b68374bcee07227c04b37d6d720831b8552d8f2f6f6baa10507d9119' 
  AND token = 'Ar09VWog3+OhPqxkz+PSeeL1gpX6b6ydA+zbir5tCuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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