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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc11b4e8a11c9b6a2779074e25f217e63c6c34cbc411460f0de76f6d05f0560f' 
  AND token = 'wzv81L/TvOWyKuE5UOICBtsM9CG4qMPnosIbvr39LVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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