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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e303e969a588a49a1ba57e233eb2b54e21e4f8b8b19a61cb4d0b8edaf964469' 
  AND token = '5z3W9eaI2tqoNUTvjpLNdIDYz9lO6SgfH5XMpknT8D0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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