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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a9b1d91f17c5c9d28aee79907e1d80bd86b0054cad055f4dc031f9ae3dddf15' 
  AND token = 'K8vga8PQmdgVaT0GAKvMwyH9iBNJXpRnk6tWZ0qt2X8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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