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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddbc63054a9adc57d9dc6e61ca458a20a45e332c2642abef0136c0c2a6127422' 
  AND token = '23FdsL9eFQ3shIQ7Vl+L8vZrpSc6jj5L9+bxf/CeT9c=' 
  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"
    }
  }
}