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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '243ed0129747731fe8ca7a91348727babb33388219adf3b93094ba0620b73244' 
  AND token = 'FONjWXpn64Ch+8XYprWVUWMIpvp/SrQvgj9suu6eCPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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