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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '434cedb89ec728061d83b0db46f9c838c7206b7c42e4faa468079dd0dd64de46' 
  AND token = '9M9e38pA4czhPNXR+0ZYKzurBYTAaVVvlbys5Hagtas=' 
  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"
    }
  }
}