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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0f7cdd054d6dfebe121d3b2a679a2d51162c24ee67b6107e54310f655738d7b' 
  AND token = 'Lv420K5vz13vIMCifSExmkveWKmK3rxKZnwAhDV3inU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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