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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '710f69da8e32a8c9ea253fdbc1c67ab613875e12da41a76d56f65693150c912c' 
  AND token = 'aH3msF7aCg8rGpwtAzyilY2UT9mEakwPvPkovT0uZt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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