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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '873c6c95d1f23e76399af633526801c9a80cfe1d0aa76adf1daa6e8ddd7111d4' 
  AND token = 'Nl86bSjl6CMiBg7uA2iokM2Lt4V2xrXzS9dN7WzoJLI=' 
  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"
    }
  }
}