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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4a0aa336f942de80ad6ff7ec18354fbce509fbff888617625467d05513e636f' 
  AND token = 'S999LV/2cs/jZgbc/O5+dbMPQnrR0RvkNkCWDtw2efs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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