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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4faaa5f76ccf839b47d3dc390271c9d908d1ee9d31460bb9d24b96387fcc3dc4' 
  AND token = 'bxTQD51e3ODvFmYhwBVBKbE6H5YV5BmAJeX1sWVN9yw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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