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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3802ca1a8ed1d07d13013f644d5f9784ef552e1900a8e2c9cddd808c501cd6b' 
  AND token = 'XST7pdwvCdz6tNw343nHmhnB+loFfjO01eVCo0E4bLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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