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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31d87aeb94f8f64e97779321fc2caced9d371cedce0717963610230829847a77' 
  AND token = 'aiNOS7jH9wkyPyGLtyFd1Luk5x+0P2s5zMx5rJZnyFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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