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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dd3b6116b78a0d228519624b9a8719dfe6e56f0ad135ca87a77ee627776746c' 
  AND token = 'tBnuRAT70/fHDbm5cTPfULEwc5dBXhHmLy1HJyUrxIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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