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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '151db595fb23aa0a72850a489bc1760a05fba9191783365f3ea26073ce47457d' 
  AND token = '5ZtiA5Hs6Fi9fwTolEhXvRbnpjGnTs3dCALPGn0bwCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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