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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31e80a84582236d6cb44e96e422ffa227077e75a34884307d5a1f6c245607ccc' 
  AND token = 'Z5SqFiDwjP0F1psTr9x6LSI6eXcnKfpKtTvc88T21zI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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