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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea1a02d66c76e72eba9a9c3a2cec028ecd7d9ce2d4034c8c05d8c0ec3a784367' 
  AND token = 'bIgQQtmq1qb2B/qFdEd11GAwRUtjnCxhQ+gwcEM0Snc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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