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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df8a667c7aff33596445570b26217a9e9cef7216ac017f10d6a361cd2f33364a' 
  AND token = '9wUQchScqe2JxaCD0Ku4Z8KtzG1VWeX0ecdYAuNiDD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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