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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6d516f772a8b383270f7725b7b0d282e52249eebe311122114a5e46d2d3a60a' 
  AND token = 'bRZS4fl0U8pVg6oVBsJ6lyv1H3M3nRezlc7EGaX6Uok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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