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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02e5c6f164d3870538e7bf75a2a54d9eefbdab5c0dd34066e9b89dde67fa26a9' 
  AND token = 'JETQZ47TwDgWCD7/FJSh1s63ijQLhvwfEQWzwIbQkws=' 
  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"
    }
  }
}