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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '372c563ea4a41718b6c61b739900716dc4348457f5a5ad81b9848f504d1ebef1' 
  AND token = 'X5GMacGkoP5VszWSMYuQSMY3R3fCyhayQi8vQW4IGmU=' 
  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"
    }
  }
}