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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29940011b500b14251a593bf277625f5c4af6f31a2acb2a0a93b8f7e9686b78e' 
  AND token = '+cUx532N1aMntKawJhwf0U5xhDZs4dh6ysER/sskPs0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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