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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22574b2629429fcbf706ec0e6a3f488e538c3b5d655c2a53f9ce7bf84dc89952' 
  AND token = 'oXndSlJAhmLZ7XF0cbn3XUL3ktdX1UwLEkvlHplOpWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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