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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88a7ece95af6c71207fb5a32420d8f495c10951e05d0dbb10aa5d70049624088' 
  AND token = 'ibfFV2+J8ZFUVc4ASEyhWeUEJLv63+jIxL5q1Lm2+Zo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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