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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ebb82eaf5975813a608fa54dc42eff1d2ce6c26376dc193066dcc96d9e77bb1' 
  AND token = 'yqXmYBoRS6tPN+NDbLZwDODNFDtHVKJl0707pvNYrEE=' 
  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"
    }
  }
}