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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35647b22ba61d81c68bf5ec31dbd2990a9cd7b9b060babcc496b51f1a88f7c8f' 
  AND token = 'kAdxtN9fprhS1/yKZAFgTByANwxjDP871b54l9wgCTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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