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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '617a29374fbbe49de71ece590191b9a182df2ab3454918e2f5267d780c78e3ae' 
  AND token = 'I0k/D1IlM8U96pjl4ytZCkekOsM/6ydFkY9qTIPaxnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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