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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65f9cdacb0c307c805c0d209558d23355f666e499d6a33520e63d98491558185' 
  AND token = 'Ka1gw4U9MUJalDlKH5oZ2FEXWIbLMTKWh93vDOe9o/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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