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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '033d502b104d8d7080870add7195c5287b0659d0dd6445f14ef0b265a25fe9ea' 
  AND token = 'dnw3F1E/OQI0PgC64FJjWwdXUbuwOf98NHrigGNLHsA=' 
  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"
    }
  }
}