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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47f3e9daf8bc252733aaaa021b9f663bb62dd787ae387b110b8df24f1fc45fc3' 
  AND token = 'EE+sh96QWnJHISSu8otbEzW0arluXzeWp9VIz19hKEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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