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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f52d53dcd77365efe89d5c785d420dbb51d169d25d0eb0024c93db07f53482a3' 
  AND token = 'BTbGpczQzX9rC07hZI3k5C4ZPB1lxmhvxW/eFtEmEKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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