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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '678ddfa66d9611f65027d60e8ae4f49e9b53f90bd35e8abca8586f3253759067' 
  AND token = 'qVpgzoU6jaL69xJ4rk880gN9RIxMAJuCo2XWXS/svks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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