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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd91a5e018e1da5a066062b9073a061444b9b291fce6620a90d7a81108cb7578' 
  AND token = 'FKbxBiuei7TzAyoWODNH2/+QvCSWa78f8DBLcHRxHLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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